Pigment.



" 25 halogenated naphthanthraquinon, and

UNITED STATES PATEN r FFICE.

ARTHUR L'UTTRINGHAUS, OF LUDWIGSHAFEN-ON-THE-RHINR, GERMANY, ASSIGNOB T0 BADISCHE ANILIN SODA FABRIK, OF LUDWIGSI-IAFEN-ON-THE-RHINE, GER- MANY, ACORPORATION.

' IGMENT.

No Drawing.

Ludwigshafen-on-the-Rhine, Germany,-have invented new and useful Improvements in Pigments, of which the following is a specification.

My invention consists. in a new composition of matter suitable for use as a pigment or lake.

I have discovered that naphthanthraquinon when mixed with substrata (such for instance as alumina, china clay, and blanc fixe) yields valuable pigments or lakes, which have a good yellow shade and. are fast against the action-of water, lime, light, alcohol, and oil. They also have good covering power. Naphthantln'aquinon can be prepared as described in the Bericlz'zc (Yer Dezztschen ('fqewre'saficnQcsellsclzafz, vol. 19, page 2209. Instead of naphthanthraquinon, its honiologues and derivatives, such foriustance as methyl-naphthanthraquinon and in particular chlor-naphthaiithraquinon, can

be employed andsimilar results be obtained.

The aforesaid homologues. and derivatives can be'obtained-for"1nstance by condensing pht-halic anhydrid with a homologue, ora

derivative, of naphthalene, or by condensing and oil.

asubst-ituted phthalic anhydrid with naphthalene, or with a homologue, oi'rlei'ivative,

thereof. Halogen derivatives can. be ohnaphthanthraquinon evolves ha ogen.

It is preferred to n ak'e use of the 'naph-= thanthraquinon, or i Shomologue, or de- 40 riva'tive, in a fine state of division. In order to obtain it in such fine state of division,

; the naphthanthraquinon or naphthanth-ra-' quinoncompou'n can'be dissolvedin con- ,centrated sulfuric acid, the solution be poured into ice and water,f'and the precipitate be filtered off and washed with hot dilutecaustic alkali solution;

The halogenated naphthanthraquinons a separate Patent .No.

"or'lakes according to my invention, which,

' however, is not confined to these examples.

5 j The parts are by weight.

in the form of paste.

. Now-what I claim is Specification of Letters Patent. Patented Aug. 23, 1910. Application filed June 22, 1909. Serial No. 503,639.

Example 1: Mix well together-a paste con taining five parts of naphthanthraduinon.

dry, and then grind the product obtained. It is 'very suitable for lithographic and three-color-process printing inks. Example 2.: Mix well together one hundred parts of barium sulfate and a.paste containing ten parts of na hthanthraquinon, v

and then dry and grind t e product, which issuitable for use in the form of a paint.

Example 3: Mix well together ten parts of aluminium sulfate, twenty parts of ba-.

rium sulfate, anda paste containing five parts of naphthanthraquinon, and to the homogeneous mixture obtained. a'dd five parts of sod-nun carbonate. Fllter, and press the product, which can be preserved In these examples, instead of napl1t-hanthraquinon itself, a homologue orderivative thereof can be, employed 1. The newcomposition of matter containing a na-phthanthraquinon body and a; substratum, adapted for use as a pigment having a yellow shade, .and being fast against theaction of,

2. The new composition of matter con-- ta n ng a naphthanthraquinon body and barium sulfate, adapted for use as a pigmen't having a yellow'sliade, and being fast against the action of water, lime, light and oil. g

The .new-compos1t1on of matter containing naphthanthraquinon1 and barium sulfate, adapted for use as apigment having a yellow shade, and'b'eing fast against the action of water,-l1me, hght and 011.

4. The new composition ofmatter containing ten" parts of: naphthanthraquinon and one hundred parts of barium sulfate, adapted for use as a pigment having ayele low sh'ade,'and being fast against the action of water, lime, light and oil. 1/

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

\ ARTHUR LUTTRINGIiAusf Witnessess ERNEST G. Emumnn'r, J. Arno. Lnoi n.

water, lime, light i 

